What element produces yellow-orange light around 600 nm? hydrogen mercury sodium neon?

Neon

Explanation:

Neon is a chemical element with atomic number 10 and symbol Ne. It is a odorless and colorless monoatomic inert gas.

This Neon can be used in vacuum, high voltage indicators, and helium neon lasers.

It forms yellow -orange light around 600 nanometer. It is inert gas and does not takes part in any chemical reaction because it has valence electrons in its outermost shell.

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number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.